U.S. Rep. Martha McSally easily raised the most money over the past three months among Arizona's congressional members, but she also spent more than all the others combined.

The second-term Republican, who holds one of the most competitive seats in the nation, raised $1 million between April and June and spent $660,000 to do it. No other member of the U.S. House of Representatives spent more in that time, Federal Election Commission records show.

She ended the quarter with $987,000 in cash, giving her a significant financial head start on Democratic challengers.

By contrast, Republican challengers in Arizona's two other competitive districts reported significant second-quarter hauls, even if the Democratic incumbents in both seats raised far more.

Arizona's six incumbents who are not expected to face difficult re-election campaigns raised far less, getting most of it from special interests instead of individuals.

Here's how it all breaks down:

McSally posts big numbers

McSally, who represents the southern Arizona district that includes parts of Tucson, got 51 percent of her larger donations from Arizona residents.

She also took in $196,000 from political-action committees, the largest portions from groups with ties to House Majority Leader Kevin McCarthy and John Bolton, the Bush-era ambassador to the United Nations.

Excluding special elections this year, McSally's campaign spent more than any other congressional campaign during the second quarter. She outspent the state's eight other incumbents combined. That happened as she has battled sinking approval ratings, tied in part to her support for the unpopular GOP health-care plan.

She poured $255,000 into campaign fundraiser mailings. That was more than all six of Arizona's safe incumbents raised for the quarter. She also retired $218,000 in campaign debt during the second quarter.

In six months, McSally has raised $1.8 million and spent $1.1 million, records show.

Her campaign declined to comment about the fundraising.

Matt Heinz, the Democrat who lost to McSally last year, reported raising $201,000 in the two weeks he had from his announcement until the end of the quarter. Mary Matiella, a retired assistant secretary of the Army, collected $31,000 in about the same span.

Bruce Wheeler, a former state lawmaker seeking the Democratic nomination to challenge McSally in 2018, announced he was entering the race on June 29 and didn't file a report with the FEC.

Sinema raises Senate-like money

As usual, U.S. Rep. Kyrsten Sinema, a Democrat, led the state's delegation in cash, ending the quarter with $3.2 million. That's a staggering sum for someone who won a third term last year by 22 percentage points, and keeps alive speculation that she could challenge Sen. Jeff Flake next year.

Steve Ferrara, a radiologist seeking the GOP nomination in Sinema's Phoenix-area district, raised $256,000 in his first quarter in the race. His campaign described the amount as the record for a first-time candidate in Arizona.

Ferrara's money, however, overwhelmingly came from outside Arizona. He raised nearly $57,000 from California compared to $29,000 from Arizona. He got almost as much from Florida as his home state.

O'Halleran faces well-financed opponent

In his first quarter running for Congress, Smith pulled in $103,000, nearly half of it in maximum donations from traditional GOP benefactors such as Earl and Randy Kendrick and Jim and Vicki Click.

Smith's average donation among disclosed donors was the highest among Arizona candidates, a sign of his support among the well-heeled. But only two of the maximum donors live in the district, potentially raising questions about how well that translates into votes.

O'Halleran, a congressional freshman, raised more from PACs than from individual donors. His relatively lean campaign expenditures allowed him to keep $389,000 in cash, four times as much as Smith.

Safe incumbents coast

There are six incumbents who seem politically secure for the moment, and their fundraising reflected it.

Republicans Andy Biggs, Trent Franks and Paul Gosar raised a combined $204,000 for the quarter. Biggs and Gosar got most of their disclosed individual donations from Arizona. Franks, whose campaign raised and spent the least in Arizona, got two donations worth $200 or more from his home state.

U.S. Rep. David Schweikert, R-Ariz., raised more money than his safe GOP colleagues, but that's only because he took in far more from PACs, $150,000.

Schweikert, a member of the powerful House Ways and Means Committee, received money from more than 80 groups last quarter. Those donors ranged from the Salt River Project PAC in Phoenix to a smattering of insurer-related PACs in places such as Massachusetts, Pennsylvania and Washington, D.C.

Democrats Ruben Gallego and Raul Grijalva also reported relatively little campaign fundraising. They had the smallest average contribution among disclosed donors.